When asked about Microsoft's plans to address different sized form factors, ranging from 4 inches all the way up to 13 inches and even bigger, Klein said that the company was ready "to respond to demand".

Microsoft and its hardware partners have so far only released tablets of 10 inches or above, with Microsoft's own Surface and Surface Pro tablets coming in at 10.6 inches.

Klein didn't confirm that 7-inch tablets were likely to launch anytime soon -- opting for a non-committal "we'll see what the customers want". But it's a noticeably different tune from last year, when Microsoft execs said there were disadvantages with 7-inch devices, even with everyday tasks such as watching movies or writing documents.

A Windows running on all different sizes of screen wouldn't be all that surprising, given Microsoft's rumoured plans to combine the Windows and Windows Phone stores, giving apps the ability to run on either platform without needing to code a separate app. "We are getting closer and closer every day to write once and run anywhere," Klein said.

Microsoft is rumoured to be working on a 7-inch gaming tablet, supposedly dubbed Xbox Surface, but the company, nor any of its partners, have yet to announce anything at that size.